EP0653030A1 - Process and device for the controlled compression of stuffing box or seal packings. - Google Patents
Process and device for the controlled compression of stuffing box or seal packings.Info
- Publication number
- EP0653030A1 EP0653030A1 EP94915069A EP94915069A EP0653030A1 EP 0653030 A1 EP0653030 A1 EP 0653030A1 EP 94915069 A EP94915069 A EP 94915069A EP 94915069 A EP94915069 A EP 94915069A EP 0653030 A1 EP0653030 A1 EP 0653030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressing force
- nominal
- chamber
- force
- clamping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012856 packing Methods 0.000 title claims description 34
- 230000006835 compression Effects 0.000 title claims description 17
- 238000007906 compression Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 17
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000011088 calibration curve Methods 0.000 claims description 13
- 210000004907 gland Anatomy 0.000 claims description 12
- 238000010586 diagram Methods 0.000 claims description 10
- 238000011156 evaluation Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/184—Tightening mechanisms
- F16J15/185—Tightening mechanisms with continuous adjustment of the compression of the packing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Definitions
- the invention relates to a method and a device for the controlled bracing of a chamber, which is open from one side and which is delimited by a chamber bottom and a preferably cylindrical chamber wall and is preferably axially penetrated by a spindle, from the opening side Chamber bottom can be acted upon with an axial pressing force and can be compressed along a clamping path and can be compressed against the chamber bottom, the chamber wall and, if necessary, the gland packing or sealing packing.
- Stuffing boxes are used to seal mutually movable parts in fittings and the like. They essentially consist of a stuffing box chamber arranged in a housing, a spindle or a plunger reaching through the stuffing box chamber, a stuffing box packing arranged in the chamber and a stuffing box gland as a pressure piece with which the stuffing box packing is clamped in the stuffing box chamber.
- the stuffing box gland is usually clamped axially parallel to the housing-fixed chamber by means of clamping screws or eyeglass screws. Due to the compressive force exerted on the packing during axial bracing, radial bracing and thus rapid the sealing force between the stuffing box and the movable spindle is generated.
- the bracing must be set so that the spindle or the plunger remains movable, but on the other hand the sealing effect is retained in all operating states. The pressing force is therefore limited both upwards and downwards within a tolerance band.
- the invention is based on the object of developing a method and a device of the type specified at the outset, with which a defined and reproducible clamping of the packing material in stuffing boxes and chambered seals can be achieved.
- the combinations of features specified in claims 1 and 9 are proposed. Further advantageous refinements and developments of the invention result from the dependent claims.
- the solution according to the invention is based above all on the idea that the packing is first subjected to a predetermined maximum compression force for the initial compression, during which plastic deformations occur which lead to sufficient pre-compression.
- This maximum pressing force can also be so high that the spindle can no longer be moved in the case of a stuffing box. The spindle movement does not yet play a role in the pre-pressing.
- the pressing force is varied several times between the maximum pressing force and a predetermined minimum pressing force, which can also be zero.
- the package is compressed under a predetermined nominal compressive force which is less than the maximum and greater than the minimum compressive force and clamped in the chamber in this state.
- the maximum compression force is maintained during the initial compression during a predetermined holding time, which may be, for example, a few minutes, before the compression force is varied several times between the maximum and the minimum pressing force.
- a predetermined holding time which may be, for example, a few minutes
- the nominal pressing force is set by increasing the pressing force from the minimum pressing force.
- the minimum pressing force is expediently chosen to be zero, while the maximum pressing force is chosen to be 1.3 to 2.5 times, preferably 1.5 to 2 times the nominal pressing force to be set.
- a preferred embodiment of the invention provides that during the variation of the pressing force, the pressing force and the associated clamping path of the pack are measured and registered as a calibration curve with the formation of a force-displacement diagram, and that the nominal pressing force by compression of the pack on the basis of the calibration curve is set to the associated span.
- the clamping path is set to the value corresponding to the nominal compression force as the packing increases in compression.
- the pressing force is expediently exerted and measured on the package by hydraulic means.
- the pressure piece is mechanically coupled to the housing on the side, which can be coupled, by means of an axial pressing force and can be compressed along a clamping path and can be pressed against the chamber interior and possibly the spindle surface or hydraulic means with the build-up of a pressing force in the package is displaceable, that a pressure or force sensor for determining the pressing force and a displacement sensor for determining the span of the pressure piece relative to the chamber housing is provided, and that the pressure or force sensor and the displacement sensor ⁇ mer are connected on the output side to an evaluation circuit for forming a force-displacement diagram as a calibration curve for setting a nominal pressure force over the clamping path of the pressure piece.
- the pressure piece can expedi
- the hydraulic means each have a clamping sleeve which can be pushed onto the free ends of the clamping screws, can be pressed against the pressure piece, and a piston which can be releasably connected to the clamping screw and engages in a pressure chamber of the clamping sleeve which can be pressurized with pressure oil on.
- the housing-fixed clamping screws have preferred wise motor nuts that can be turned against the pressure piece, whereby the clamping sleeves for the initial measuring process can be pushed onto the tensioning screws either instead of the clamping nuts or with the clamping nuts attached and can be pressed against the pressure piece.
- the pressure piece is designed as a stuffing box gland with a central opening for the spindle and with further openings for the clamping screws.
- the evaluation circuit advantageously has a microprocessor-based or computer-based evaluation unit with a program for calculating, displaying and / or adjusting the clamping path belonging to the nominal pressing force, taking into account the recorded calibration curve on.
- FIG. 2 shows a measuring arrangement for recording a force-displacement diagram of the stuffing box and for determining the nominal clamping distance
- Fig. 3 is a force-displacement diagram.
- the stuffing box shown in FIG. 1 essentially consists of a housing 10 with a stuffing box chamber 12 which has a chamber bottom 14 and a cylindrical chamber wall 16, a spindle 18 passing through the stuffing box chamber 12 and the chamber bottom 14, one in which Stuffing box chamber 12 in the annular space between the spindle 18 and the chamber wall 16 arranged stuffing box packing 20, a stuffing box goggle 26 engaging with a pressure piece 22 through the opening 24 on the inside and lying there against the stuffing box packing and several with the cam ⁇ mer housing 10 displaceably connected, through holes 28 of the stuffing box with play grasping the clamping screws 30, on which against the stuffing box glasses are exerted by pressing force on the packing 20 tightening nuts 31 are guided.
- the pressure piece 26 also has an opening 32 for the passage of the spindle 18.
- the pressing force F exerted via the clamping nuts 31 and the gland follower 26 is to be selected so that the gland packing 20 clamped between the pressure piece 22 and the chamber bottom 14 is pressed against the spindle surface with a sufficient radial sealing force and the spindle nevertheless has the desired mobility .
- the measuring arrangement shown in FIG. 2 is used to prepare a defined tensioning of the stuffing box packing 20.
- the clamping nuts 31 are replaced by a clamping sleeve 40 and one on the free one Unscrewed end of the clamping screw 31, in the interior of the clamping sleeve 40 sealingly engaging piston nut 42.
- the clamping sleeve 40 is arranged coaxially to the clamping screw 30 and axially displaceable therewith. It sits on the stuffing box gland 26 with its end face pointing downward.
- the annular space of the clamping sleeves 40 can be pressurized with pressure oil via a hydraulic cylinder 46 or a hydraulic pump and a common hydraulic line 48.
- the packing gland 20 is acted upon by the clamping sleeves 40 and the packing gland 26 with a pressing force F which is dependent on the hydraulic pressure p in the line 48 and via the branch line 50 in a computer-aided evaluation unit 52 and can be continuously registered.
- the clamping path s can be measured directly or indirectly as a function of the pressing force F via a displacement transducer 54 shown symbolically and can be registered in the measuring circuit 52. In this way, a force-displacement diagram can be recorded, registered and displayed on a screen 54, as shown in FIG. 3.
- a reproducible characteristic curve 3 is obtained, which has a non-linear descending branch and an approximately linear ascending branch in the manner of a hysteresis, which extends over the span ⁇ 0 to v .
- the aim of this measurement process is to record a calibration curve, which is formed by the rising branch of curve 3 of the force-displacement diagram.
- the stuffing box is now braced in that after the clamping sleeves 40 coupled for the measurement have been removed, the clamping nuts 31 are screwed back onto the clamping screws 30 (FIG. 1).
- the associated clamping path s nominal is, for example, evaluated by the evaluation unit 52 Numerical value calculated from the nominal pressing force to be set and displayed.
- the tensioning nuts 31 can be adjusted either by hand or by motor.
- the invention relates to a method and a device for the controlled tightening of a stuffing box 12, 20, 22. According to the invention, this takes place in that the stuffing box packing 20 is subjected to a predetermined maximum pressing force for the initial compression, that the pressing force F is then varied several times between the maximum pressing force and a predetermined minimum pressing force and that the packing is finally compressed and compressed under a predetermined nominal pressing force is clamped in the chamber 12 in this state.
- the associated clamping path s of the package 20 is measured and registered as a calibration curve, forming a force-path diagram.
- the nominal pressing force can then be set by compressing the packing on the basis of the calibration curve by measuring the tensioning path.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Nanotechnology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Sealing Devices (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Package Closures (AREA)
- Closing Of Containers (AREA)
- Container Filling Or Packaging Operations (AREA)
- Buffer Packaging (AREA)
- Packages (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4318157 | 1993-06-01 | ||
| DE4318157A DE4318157A1 (en) | 1993-06-01 | 1993-06-01 | Method and device for the controlled tightening of stuffing box or seal packings |
| PCT/EP1994/001217 WO1994028336A1 (en) | 1993-06-01 | 1994-04-20 | Process and device for the controlled compression of stuffing box or seal packings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0653030A1 true EP0653030A1 (en) | 1995-05-17 |
| EP0653030B1 EP0653030B1 (en) | 1997-07-02 |
Family
ID=6489358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94915069A Expired - Lifetime EP0653030B1 (en) | 1993-06-01 | 1994-04-20 | Process and device for the controlled compression of stuffing box or seal packings |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0653030B1 (en) |
| AT (1) | ATE154970T1 (en) |
| CA (1) | CA2141189A1 (en) |
| DE (2) | DE4318157A1 (en) |
| WO (1) | WO1994028336A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5537734A (en) * | 1995-01-30 | 1996-07-23 | Western Atlas, Inc. | Press |
| US5607165A (en) * | 1995-06-07 | 1997-03-04 | Cooper Cameron Corporation | Sealing system for a valve having biassed sealant under pressure |
| DE19614734A1 (en) * | 1996-04-15 | 1996-10-17 | Klaasens Ursula | Pressure measuring device for hot tool butt welding machines |
| RU2201321C1 (en) * | 2001-10-29 | 2003-03-27 | Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет | Method for controlling pressing-in process in electromechanical press |
| US7661184B2 (en) * | 2003-11-26 | 2010-02-16 | Swagelok Company | Load applying tool |
| DE102014015891B4 (en) * | 2014-10-27 | 2024-10-17 | Samson Ag | Control valve comprising a sealing arrangement |
| DE102014015889B4 (en) * | 2014-10-27 | 2024-10-10 | Samson Ag | Control valve comprising a sealing arrangement |
| CN104896182A (en) * | 2015-06-18 | 2015-09-09 | 无锡众扬金属制品有限公司 | Valve sealing part |
| DE102017221088A1 (en) * | 2017-11-24 | 2019-05-29 | Bhs-Sonthofen Gmbh | Device for tensioning a stuffing box packing |
| CN109340378B (en) * | 2018-11-12 | 2023-12-01 | 中国船舶重工集团公司第七一九研究所 | Automatic packing sealing device compresses tightly |
| WO2023061560A1 (en) * | 2021-10-12 | 2023-04-20 | Bhs-Sonthofen Gmbh | Device for clamping a stuffing box packing |
-
1993
- 1993-06-01 DE DE4318157A patent/DE4318157A1/en not_active Withdrawn
-
1994
- 1994-04-20 CA CA002141189A patent/CA2141189A1/en not_active Abandoned
- 1994-04-20 EP EP94915069A patent/EP0653030B1/en not_active Expired - Lifetime
- 1994-04-20 DE DE59403248T patent/DE59403248D1/en not_active Expired - Lifetime
- 1994-04-20 WO PCT/EP1994/001217 patent/WO1994028336A1/en not_active Ceased
- 1994-04-20 AT AT94915069T patent/ATE154970T1/en not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9428336A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE154970T1 (en) | 1997-07-15 |
| EP0653030B1 (en) | 1997-07-02 |
| WO1994028336A1 (en) | 1994-12-08 |
| DE59403248D1 (en) | 1997-08-07 |
| CA2141189A1 (en) | 1994-12-08 |
| DE4318157A1 (en) | 1994-12-08 |
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